Products and Ranges
- Temperature range from 180°C - 240°C
= Reinigungscompound RC CORDUMA ® 6921 (Cleaning-Compound RC 6921)
- Temperature range from 240°C - 330°C
= Reinigungscompound CORDUMA ® HT 6923 (Cleaning-Compound HT 6923)
- Special Cleaning-Compound for PS (injection moulding and extrusion)
= CORDUSTAT 3956/PS
- Shut-down-Masterbatch for extrusion lines (PE, PP, EVA)
= CORDUMA ® EF 6930
Mode of action
Cleaning-Compounds are mixtures of special Masterbatches designed for optimum temperature range. Burned lumps of material, rests of pigment and other deposits on the screw and in the cylinder or on the blown films heads respectively extrusion nozzles are softened, rubbed off, and pressed out in a physical way. The Cleaning-Compound does not contain any abrasive components which might damage the machine parts. The Cleaning-Compound reacts thermoplastic and can also be injected into the tool (RC 6921 also through externally heated hot runner). Sieves, nozzles etc. don't have to be demounted.
Processing
The following steps lead to an optimal cleaning of the machine:- Mix the Cleaning-Compound with the resin which will be used after the cleaning (see dosage).
- Move injection unit back.
- Pass through respectively inject 2-3 screw volumes of the cleaning mixture with the highest possible number of screw revolutions until the strand material does not contain rests of pigment or burned lumps any more.
- Move injection unit to the tool.
- Inject the Cleaning-Compound about 5 times with the highest possible speed into the tool.
- Then inject about 5 shots with the new plastic respectively the new dye.
- The production can be started again.
Effect of CORDUMA ® EF 6930
CORDUMA ® EF 6930 is a Cleaning-Compound which resists extreme temperature loads. Burned lumps of material, rests of pigment and other sediments on the screw, in the barrel or on blow heads respectively extrusion dies are softened, rubbed off and pressed out. The Cleaning-Compound does not contain any abrasive components, which might damage the machine parts.
The modification of CORDUMA ® EF 6930 with a thermostabilizer combination allows the as Shut-down-Compound. In this way machine shut downs do not require any idle running for emptying the screw, followed by the cleaning of it! During the cooling down phase the shut-down masterbatch remains in the extruder. During this time the rests of pigment and burned lumps of material are softened and alloyed. After the renewed heating up the rests of material are pressed out by the starting process. CORDUMA ® EF 6930 behaves thermoplastically and is extrudable to profiles or films. Therefore, demounting of sieves, dies etc. is not required any more.
Processing and dosage
As a shut-down mixture:
Before stopping the extrusion plant at least one screw filling of CORDUMA ® EF 6930 should be passed through. Then the machine filled is switched off. With the next heating process the screw filling plasticizes and the usual starting process can begin. For complete cleaning of the screw it is recommended to run at least one screw filling in addition at the start. Old incrustations at the blow heads should be removed mechanically.
As a cleaning mixture with interruption of the production:
With a change of material one screw filling of CORDUMA ® EF 6930 is put into the extruder and left there for 5-15 minutes. The cleaning effect can be increased by cooling down the extruder in addition. Afterwards the extruder is heated up again and the melting is moved out with the maximum possible screw speed as well as the maximum possible back pressure.
Advantages
- saves working time
- saves material by intensive quick cleaning
- recycling ability: 100%
Food contact approval
In general, nearly all of the active agents are admitted within the usual dosage, according to the BfR-recommendations.
The particular data can be taken out of the product information sheets.
Approvals of other authorities, especially FDA- and EC-approvals are present in most cases and are available, if required.
Do you have questions or do you need detailed product information?
Please contact us!
